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The special-relativistic relation connecting energy with mass, $ E^2 - (m c^2)^2= (pc)^2 $. May be used to provide accounting constraints in energy and momentum, both conserved in total, even in reactions where $m$ is not.
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Where does all the mass created from energy go?
Mass, as discovered by Albert Einstein in his Special Theory of Relativity, is no more than another form of energy. When a proton (or any other object) speeds up, it gains kinetic energy which in turn …